Problem with install Debian Etch on a Software Raid 1

Hi
I need someone to tell me, what I am doing wrong. I installed Etch on 2x 250GB sata disks acording to instruction that I found on this site http://ads.wars-nicht.de/blog/archi...ch-on-a-Software-Raid-1-with-S-ATA-disks.html
However, when I remove sdb disk, system will boot fine from sda, but when I remove sda disk, system will not boot.
Looks like the grub is not installed on sdb disk. Could someone please tell me, how to fix this, or maybe even some other way to install software raid1? Perfect setup maybe?

At the 'grub' shell prompt I created new boot records for both drives:

Code:

root (hd0,0)
setup (hd0)
root (hd1,0)
setup (hd1)
quit

Test went fine this time.
Final step was adding fallback entry, that will automaticlly choose the next item in the menu if the first one fails. In /boot/grub/menu.lst I added entry `fallback 1` just below the `default 0` entry.